SemaType.cpp revision abe2354f279c7992c260c29c1d48fd8ed6ce50a2
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements type-related semantic analysis. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/CXXInheritance.h" 17#include "clang/AST/DeclObjC.h" 18#include "clang/AST/DeclTemplate.h" 19#include "clang/AST/TypeLoc.h" 20#include "clang/AST/TypeLocVisitor.h" 21#include "clang/AST/Expr.h" 22#include "clang/Basic/PartialDiagnostic.h" 23#include "clang/Parse/DeclSpec.h" 24#include "llvm/ADT/SmallPtrSet.h" 25#include "llvm/Support/ErrorHandling.h" 26using namespace clang; 27 28/// \brief Perform adjustment on the parameter type of a function. 29/// 30/// This routine adjusts the given parameter type @p T to the actual 31/// parameter type used by semantic analysis (C99 6.7.5.3p[7,8], 32/// C++ [dcl.fct]p3). The adjusted parameter type is returned. 33QualType Sema::adjustParameterType(QualType T) { 34 // C99 6.7.5.3p7: 35 // A declaration of a parameter as "array of type" shall be 36 // adjusted to "qualified pointer to type", where the type 37 // qualifiers (if any) are those specified within the [ and ] of 38 // the array type derivation. 39 if (T->isArrayType()) 40 return Context.getArrayDecayedType(T); 41 42 // C99 6.7.5.3p8: 43 // A declaration of a parameter as "function returning type" 44 // shall be adjusted to "pointer to function returning type", as 45 // in 6.3.2.1. 46 if (T->isFunctionType()) 47 return Context.getPointerType(T); 48 49 return T; 50} 51 52 53 54/// isOmittedBlockReturnType - Return true if this declarator is missing a 55/// return type because this is a omitted return type on a block literal. 56static bool isOmittedBlockReturnType(const Declarator &D) { 57 if (D.getContext() != Declarator::BlockLiteralContext || 58 D.getDeclSpec().hasTypeSpecifier()) 59 return false; 60 61 if (D.getNumTypeObjects() == 0) 62 return true; // ^{ ... } 63 64 if (D.getNumTypeObjects() == 1 && 65 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 66 return true; // ^(int X, float Y) { ... } 67 68 return false; 69} 70 71typedef std::pair<const AttributeList*,QualType> DelayedAttribute; 72typedef llvm::SmallVectorImpl<DelayedAttribute> DelayedAttributeSet; 73 74static void ProcessTypeAttributeList(Sema &S, QualType &Type, 75 bool IsDeclSpec, 76 const AttributeList *Attrs, 77 DelayedAttributeSet &DelayedFnAttrs); 78static bool ProcessFnAttr(Sema &S, QualType &Type, const AttributeList &Attr); 79 80static void ProcessDelayedFnAttrs(Sema &S, QualType &Type, 81 DelayedAttributeSet &Attrs) { 82 for (DelayedAttributeSet::iterator I = Attrs.begin(), 83 E = Attrs.end(); I != E; ++I) 84 if (ProcessFnAttr(S, Type, *I->first)) 85 S.Diag(I->first->getLoc(), diag::warn_function_attribute_wrong_type) 86 << I->first->getName() << I->second; 87 Attrs.clear(); 88} 89 90static void DiagnoseDelayedFnAttrs(Sema &S, DelayedAttributeSet &Attrs) { 91 for (DelayedAttributeSet::iterator I = Attrs.begin(), 92 E = Attrs.end(); I != E; ++I) { 93 S.Diag(I->first->getLoc(), diag::warn_function_attribute_wrong_type) 94 << I->first->getName() << I->second; 95 } 96 Attrs.clear(); 97} 98 99/// \brief Convert the specified declspec to the appropriate type 100/// object. 101/// \param D the declarator containing the declaration specifier. 102/// \returns The type described by the declaration specifiers. This function 103/// never returns null. 104static QualType ConvertDeclSpecToType(Sema &TheSema, 105 Declarator &TheDeclarator, 106 DelayedAttributeSet &Delayed) { 107 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 108 // checking. 109 const DeclSpec &DS = TheDeclarator.getDeclSpec(); 110 SourceLocation DeclLoc = TheDeclarator.getIdentifierLoc(); 111 if (DeclLoc.isInvalid()) 112 DeclLoc = DS.getSourceRange().getBegin(); 113 114 ASTContext &Context = TheSema.Context; 115 116 QualType Result; 117 switch (DS.getTypeSpecType()) { 118 case DeclSpec::TST_void: 119 Result = Context.VoidTy; 120 break; 121 case DeclSpec::TST_char: 122 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 123 Result = Context.CharTy; 124 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 125 Result = Context.SignedCharTy; 126 else { 127 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 128 "Unknown TSS value"); 129 Result = Context.UnsignedCharTy; 130 } 131 break; 132 case DeclSpec::TST_wchar: 133 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 134 Result = Context.WCharTy; 135 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 136 TheSema.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 137 << DS.getSpecifierName(DS.getTypeSpecType()); 138 Result = Context.getSignedWCharType(); 139 } else { 140 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 141 "Unknown TSS value"); 142 TheSema.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 143 << DS.getSpecifierName(DS.getTypeSpecType()); 144 Result = Context.getUnsignedWCharType(); 145 } 146 break; 147 case DeclSpec::TST_char16: 148 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 149 "Unknown TSS value"); 150 Result = Context.Char16Ty; 151 break; 152 case DeclSpec::TST_char32: 153 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 154 "Unknown TSS value"); 155 Result = Context.Char32Ty; 156 break; 157 case DeclSpec::TST_unspecified: 158 // "<proto1,proto2>" is an objc qualified ID with a missing id. 159 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 160 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy, 161 (ObjCProtocolDecl**)PQ, 162 DS.getNumProtocolQualifiers()); 163 break; 164 } 165 166 // If this is a missing declspec in a block literal return context, then it 167 // is inferred from the return statements inside the block. 168 if (isOmittedBlockReturnType(TheDeclarator)) { 169 Result = Context.DependentTy; 170 break; 171 } 172 173 // Unspecified typespec defaults to int in C90. However, the C90 grammar 174 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 175 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 176 // Note that the one exception to this is function definitions, which are 177 // allowed to be completely missing a declspec. This is handled in the 178 // parser already though by it pretending to have seen an 'int' in this 179 // case. 180 if (TheSema.getLangOptions().ImplicitInt) { 181 // In C89 mode, we only warn if there is a completely missing declspec 182 // when one is not allowed. 183 if (DS.isEmpty()) { 184 TheSema.Diag(DeclLoc, diag::ext_missing_declspec) 185 << DS.getSourceRange() 186 << FixItHint::CreateInsertion(DS.getSourceRange().getBegin(), "int"); 187 } 188 } else if (!DS.hasTypeSpecifier()) { 189 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 190 // "At least one type specifier shall be given in the declaration 191 // specifiers in each declaration, and in the specifier-qualifier list in 192 // each struct declaration and type name." 193 // FIXME: Does Microsoft really have the implicit int extension in C++? 194 if (TheSema.getLangOptions().CPlusPlus && 195 !TheSema.getLangOptions().Microsoft) { 196 TheSema.Diag(DeclLoc, diag::err_missing_type_specifier) 197 << DS.getSourceRange(); 198 199 // When this occurs in C++ code, often something is very broken with the 200 // value being declared, poison it as invalid so we don't get chains of 201 // errors. 202 TheDeclarator.setInvalidType(true); 203 } else { 204 TheSema.Diag(DeclLoc, diag::ext_missing_type_specifier) 205 << DS.getSourceRange(); 206 } 207 } 208 209 // FALL THROUGH. 210 case DeclSpec::TST_int: { 211 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 212 switch (DS.getTypeSpecWidth()) { 213 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 214 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 215 case DeclSpec::TSW_long: Result = Context.LongTy; break; 216 case DeclSpec::TSW_longlong: 217 Result = Context.LongLongTy; 218 219 // long long is a C99 feature. 220 if (!TheSema.getLangOptions().C99 && 221 !TheSema.getLangOptions().CPlusPlus0x) 222 TheSema.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong); 223 break; 224 } 225 } else { 226 switch (DS.getTypeSpecWidth()) { 227 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 228 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 229 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 230 case DeclSpec::TSW_longlong: 231 Result = Context.UnsignedLongLongTy; 232 233 // long long is a C99 feature. 234 if (!TheSema.getLangOptions().C99 && 235 !TheSema.getLangOptions().CPlusPlus0x) 236 TheSema.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong); 237 break; 238 } 239 } 240 break; 241 } 242 case DeclSpec::TST_float: Result = Context.FloatTy; break; 243 case DeclSpec::TST_double: 244 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 245 Result = Context.LongDoubleTy; 246 else 247 Result = Context.DoubleTy; 248 break; 249 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 250 case DeclSpec::TST_decimal32: // _Decimal32 251 case DeclSpec::TST_decimal64: // _Decimal64 252 case DeclSpec::TST_decimal128: // _Decimal128 253 TheSema.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 254 Result = Context.IntTy; 255 TheDeclarator.setInvalidType(true); 256 break; 257 case DeclSpec::TST_class: 258 case DeclSpec::TST_enum: 259 case DeclSpec::TST_union: 260 case DeclSpec::TST_struct: { 261 TypeDecl *D 262 = dyn_cast_or_null<TypeDecl>(static_cast<Decl *>(DS.getTypeRep())); 263 if (!D) { 264 // This can happen in C++ with ambiguous lookups. 265 Result = Context.IntTy; 266 TheDeclarator.setInvalidType(true); 267 break; 268 } 269 270 // If the type is deprecated or unavailable, diagnose it. 271 TheSema.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeLoc()); 272 273 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 274 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 275 276 // TypeQuals handled by caller. 277 Result = Context.getTypeDeclType(D); 278 279 // In C++, make an ElaboratedType. 280 if (TheSema.getLangOptions().CPlusPlus) { 281 TagDecl::TagKind Tag 282 = TagDecl::getTagKindForTypeSpec(DS.getTypeSpecType()); 283 Result = TheSema.getQualifiedNameType(DS.getTypeSpecScope(), Result); 284 Result = Context.getElaboratedType(Result, Tag); 285 } 286 287 if (D->isInvalidDecl()) 288 TheDeclarator.setInvalidType(true); 289 break; 290 } 291 case DeclSpec::TST_typename: { 292 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 293 DS.getTypeSpecSign() == 0 && 294 "Can't handle qualifiers on typedef names yet!"); 295 Result = TheSema.GetTypeFromParser(DS.getTypeRep()); 296 297 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 298 if (const ObjCInterfaceType * 299 Interface = Result->getAs<ObjCInterfaceType>()) { 300 // It would be nice if protocol qualifiers were only stored with the 301 // ObjCObjectPointerType. Unfortunately, this isn't possible due 302 // to the following typedef idiom (which is uncommon, but allowed): 303 // 304 // typedef Foo<P> T; 305 // static void func() { 306 // Foo<P> *yy; 307 // T *zz; 308 // } 309 Result = Context.getObjCInterfaceType(Interface->getDecl(), 310 (ObjCProtocolDecl**)PQ, 311 DS.getNumProtocolQualifiers()); 312 } else if (Result->isObjCIdType()) 313 // id<protocol-list> 314 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinIdTy, 315 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers()); 316 else if (Result->isObjCClassType()) { 317 // Class<protocol-list> 318 Result = Context.getObjCObjectPointerType(Context.ObjCBuiltinClassTy, 319 (ObjCProtocolDecl**)PQ, DS.getNumProtocolQualifiers()); 320 } else { 321 TheSema.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 322 << DS.getSourceRange(); 323 TheDeclarator.setInvalidType(true); 324 } 325 } 326 327 // TypeQuals handled by caller. 328 break; 329 } 330 case DeclSpec::TST_typeofType: 331 // FIXME: Preserve type source info. 332 Result = TheSema.GetTypeFromParser(DS.getTypeRep()); 333 assert(!Result.isNull() && "Didn't get a type for typeof?"); 334 // TypeQuals handled by caller. 335 Result = Context.getTypeOfType(Result); 336 break; 337 case DeclSpec::TST_typeofExpr: { 338 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 339 assert(E && "Didn't get an expression for typeof?"); 340 // TypeQuals handled by caller. 341 Result = TheSema.BuildTypeofExprType(E); 342 if (Result.isNull()) { 343 Result = Context.IntTy; 344 TheDeclarator.setInvalidType(true); 345 } 346 break; 347 } 348 case DeclSpec::TST_decltype: { 349 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 350 assert(E && "Didn't get an expression for decltype?"); 351 // TypeQuals handled by caller. 352 Result = TheSema.BuildDecltypeType(E); 353 if (Result.isNull()) { 354 Result = Context.IntTy; 355 TheDeclarator.setInvalidType(true); 356 } 357 break; 358 } 359 case DeclSpec::TST_auto: { 360 // TypeQuals handled by caller. 361 Result = Context.UndeducedAutoTy; 362 break; 363 } 364 365 case DeclSpec::TST_error: 366 Result = Context.IntTy; 367 TheDeclarator.setInvalidType(true); 368 break; 369 } 370 371 // Handle complex types. 372 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 373 if (TheSema.getLangOptions().Freestanding) 374 TheSema.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 375 Result = Context.getComplexType(Result); 376 } else if (DS.isTypeAltiVecVector()) { 377 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 378 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 379 Result = Context.getVectorType(Result, 128/typeSize, true, 380 DS.isTypeAltiVecPixel()); 381 } 382 383 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 384 "FIXME: imaginary types not supported yet!"); 385 386 // See if there are any attributes on the declspec that apply to the type (as 387 // opposed to the decl). 388 if (const AttributeList *AL = DS.getAttributes()) 389 ProcessTypeAttributeList(TheSema, Result, true, AL, Delayed); 390 391 // Apply const/volatile/restrict qualifiers to T. 392 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 393 394 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 395 // or incomplete types shall not be restrict-qualified." C++ also allows 396 // restrict-qualified references. 397 if (TypeQuals & DeclSpec::TQ_restrict) { 398 if (Result->isAnyPointerType() || Result->isReferenceType()) { 399 QualType EltTy; 400 if (Result->isObjCObjectPointerType()) 401 EltTy = Result; 402 else 403 EltTy = Result->isPointerType() ? 404 Result->getAs<PointerType>()->getPointeeType() : 405 Result->getAs<ReferenceType>()->getPointeeType(); 406 407 // If we have a pointer or reference, the pointee must have an object 408 // incomplete type. 409 if (!EltTy->isIncompleteOrObjectType()) { 410 TheSema.Diag(DS.getRestrictSpecLoc(), 411 diag::err_typecheck_invalid_restrict_invalid_pointee) 412 << EltTy << DS.getSourceRange(); 413 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 414 } 415 } else { 416 TheSema.Diag(DS.getRestrictSpecLoc(), 417 diag::err_typecheck_invalid_restrict_not_pointer) 418 << Result << DS.getSourceRange(); 419 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 420 } 421 } 422 423 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 424 // of a function type includes any type qualifiers, the behavior is 425 // undefined." 426 if (Result->isFunctionType() && TypeQuals) { 427 // Get some location to point at, either the C or V location. 428 SourceLocation Loc; 429 if (TypeQuals & DeclSpec::TQ_const) 430 Loc = DS.getConstSpecLoc(); 431 else if (TypeQuals & DeclSpec::TQ_volatile) 432 Loc = DS.getVolatileSpecLoc(); 433 else { 434 assert((TypeQuals & DeclSpec::TQ_restrict) && 435 "Has CVR quals but not C, V, or R?"); 436 Loc = DS.getRestrictSpecLoc(); 437 } 438 TheSema.Diag(Loc, diag::warn_typecheck_function_qualifiers) 439 << Result << DS.getSourceRange(); 440 } 441 442 // C++ [dcl.ref]p1: 443 // Cv-qualified references are ill-formed except when the 444 // cv-qualifiers are introduced through the use of a typedef 445 // (7.1.3) or of a template type argument (14.3), in which 446 // case the cv-qualifiers are ignored. 447 // FIXME: Shouldn't we be checking SCS_typedef here? 448 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 449 TypeQuals && Result->isReferenceType()) { 450 TypeQuals &= ~DeclSpec::TQ_const; 451 TypeQuals &= ~DeclSpec::TQ_volatile; 452 } 453 454 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 455 Result = Context.getQualifiedType(Result, Quals); 456 } 457 458 return Result; 459} 460 461static std::string getPrintableNameForEntity(DeclarationName Entity) { 462 if (Entity) 463 return Entity.getAsString(); 464 465 return "type name"; 466} 467 468/// \brief Build a pointer type. 469/// 470/// \param T The type to which we'll be building a pointer. 471/// 472/// \param Quals The cvr-qualifiers to be applied to the pointer type. 473/// 474/// \param Loc The location of the entity whose type involves this 475/// pointer type or, if there is no such entity, the location of the 476/// type that will have pointer type. 477/// 478/// \param Entity The name of the entity that involves the pointer 479/// type, if known. 480/// 481/// \returns A suitable pointer type, if there are no 482/// errors. Otherwise, returns a NULL type. 483QualType Sema::BuildPointerType(QualType T, unsigned Quals, 484 SourceLocation Loc, DeclarationName Entity) { 485 if (T->isReferenceType()) { 486 // C++ 8.3.2p4: There shall be no ... pointers to references ... 487 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 488 << getPrintableNameForEntity(Entity) << T; 489 return QualType(); 490 } 491 492 Qualifiers Qs = Qualifiers::fromCVRMask(Quals); 493 494 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 495 // object or incomplete types shall not be restrict-qualified." 496 if (Qs.hasRestrict() && !T->isIncompleteOrObjectType()) { 497 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 498 << T; 499 Qs.removeRestrict(); 500 } 501 502 assert(!T->isObjCInterfaceType() && "Should build ObjCObjectPointerType"); 503 504 // Build the pointer type. 505 return Context.getQualifiedType(Context.getPointerType(T), Qs); 506} 507 508/// \brief Build a reference type. 509/// 510/// \param T The type to which we'll be building a reference. 511/// 512/// \param CVR The cvr-qualifiers to be applied to the reference type. 513/// 514/// \param Loc The location of the entity whose type involves this 515/// reference type or, if there is no such entity, the location of the 516/// type that will have reference type. 517/// 518/// \param Entity The name of the entity that involves the reference 519/// type, if known. 520/// 521/// \returns A suitable reference type, if there are no 522/// errors. Otherwise, returns a NULL type. 523QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 524 unsigned CVR, SourceLocation Loc, 525 DeclarationName Entity) { 526 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 527 528 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 529 530 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 531 // reference to a type T, and attempt to create the type "lvalue 532 // reference to cv TD" creates the type "lvalue reference to T". 533 // We use the qualifiers (restrict or none) of the original reference, 534 // not the new ones. This is consistent with GCC. 535 536 // C++ [dcl.ref]p4: There shall be no references to references. 537 // 538 // According to C++ DR 106, references to references are only 539 // diagnosed when they are written directly (e.g., "int & &"), 540 // but not when they happen via a typedef: 541 // 542 // typedef int& intref; 543 // typedef intref& intref2; 544 // 545 // Parser::ParseDeclaratorInternal diagnoses the case where 546 // references are written directly; here, we handle the 547 // collapsing of references-to-references as described in C++ 548 // DR 106 and amended by C++ DR 540. 549 550 // C++ [dcl.ref]p1: 551 // A declarator that specifies the type "reference to cv void" 552 // is ill-formed. 553 if (T->isVoidType()) { 554 Diag(Loc, diag::err_reference_to_void); 555 return QualType(); 556 } 557 558 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 559 // object or incomplete types shall not be restrict-qualified." 560 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 561 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 562 << T; 563 Quals.removeRestrict(); 564 } 565 566 // C++ [dcl.ref]p1: 567 // [...] Cv-qualified references are ill-formed except when the 568 // cv-qualifiers are introduced through the use of a typedef 569 // (7.1.3) or of a template type argument (14.3), in which case 570 // the cv-qualifiers are ignored. 571 // 572 // We diagnose extraneous cv-qualifiers for the non-typedef, 573 // non-template type argument case within the parser. Here, we just 574 // ignore any extraneous cv-qualifiers. 575 Quals.removeConst(); 576 Quals.removeVolatile(); 577 578 // Handle restrict on references. 579 if (LValueRef) 580 return Context.getQualifiedType( 581 Context.getLValueReferenceType(T, SpelledAsLValue), Quals); 582 return Context.getQualifiedType(Context.getRValueReferenceType(T), Quals); 583} 584 585/// \brief Build an array type. 586/// 587/// \param T The type of each element in the array. 588/// 589/// \param ASM C99 array size modifier (e.g., '*', 'static'). 590/// 591/// \param ArraySize Expression describing the size of the array. 592/// 593/// \param Quals The cvr-qualifiers to be applied to the array's 594/// element type. 595/// 596/// \param Loc The location of the entity whose type involves this 597/// array type or, if there is no such entity, the location of the 598/// type that will have array type. 599/// 600/// \param Entity The name of the entity that involves the array 601/// type, if known. 602/// 603/// \returns A suitable array type, if there are no errors. Otherwise, 604/// returns a NULL type. 605QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 606 Expr *ArraySize, unsigned Quals, 607 SourceRange Brackets, DeclarationName Entity) { 608 609 SourceLocation Loc = Brackets.getBegin(); 610 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 611 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 612 // Not in C++, though. There we only dislike void. 613 if (getLangOptions().CPlusPlus) { 614 if (T->isVoidType()) { 615 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 616 return QualType(); 617 } 618 } else { 619 if (RequireCompleteType(Loc, T, 620 diag::err_illegal_decl_array_incomplete_type)) 621 return QualType(); 622 } 623 624 if (T->isFunctionType()) { 625 Diag(Loc, diag::err_illegal_decl_array_of_functions) 626 << getPrintableNameForEntity(Entity) << T; 627 return QualType(); 628 } 629 630 // C++ 8.3.2p4: There shall be no ... arrays of references ... 631 if (T->isReferenceType()) { 632 Diag(Loc, diag::err_illegal_decl_array_of_references) 633 << getPrintableNameForEntity(Entity) << T; 634 return QualType(); 635 } 636 637 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) { 638 Diag(Loc, diag::err_illegal_decl_array_of_auto) 639 << getPrintableNameForEntity(Entity); 640 return QualType(); 641 } 642 643 if (const RecordType *EltTy = T->getAs<RecordType>()) { 644 // If the element type is a struct or union that contains a variadic 645 // array, accept it as a GNU extension: C99 6.7.2.1p2. 646 if (EltTy->getDecl()->hasFlexibleArrayMember()) 647 Diag(Loc, diag::ext_flexible_array_in_array) << T; 648 } else if (T->isObjCInterfaceType()) { 649 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 650 return QualType(); 651 } 652 653 // C99 6.7.5.2p1: The size expression shall have integer type. 654 if (ArraySize && !ArraySize->isTypeDependent() && 655 !ArraySize->getType()->isIntegerType()) { 656 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 657 << ArraySize->getType() << ArraySize->getSourceRange(); 658 ArraySize->Destroy(Context); 659 return QualType(); 660 } 661 llvm::APSInt ConstVal(32); 662 if (!ArraySize) { 663 if (ASM == ArrayType::Star) 664 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 665 else 666 T = Context.getIncompleteArrayType(T, ASM, Quals); 667 } else if (ArraySize->isValueDependent()) { 668 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 669 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 670 (!T->isDependentType() && !T->isIncompleteType() && 671 !T->isConstantSizeType())) { 672 // Per C99, a variable array is an array with either a non-constant 673 // size or an element type that has a non-constant-size 674 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 675 } else { 676 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 677 // have a value greater than zero. 678 if (ConstVal.isSigned() && ConstVal.isNegative()) { 679 Diag(ArraySize->getLocStart(), 680 diag::err_typecheck_negative_array_size) 681 << ArraySize->getSourceRange(); 682 return QualType(); 683 } 684 if (ConstVal == 0) { 685 // GCC accepts zero sized static arrays. We allow them when 686 // we're not in a SFINAE context. 687 Diag(ArraySize->getLocStart(), 688 isSFINAEContext()? diag::err_typecheck_zero_array_size 689 : diag::ext_typecheck_zero_array_size) 690 << ArraySize->getSourceRange(); 691 } 692 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 693 } 694 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 695 if (!getLangOptions().C99) { 696 if (ArraySize && !ArraySize->isTypeDependent() && 697 !ArraySize->isValueDependent() && 698 !ArraySize->isIntegerConstantExpr(Context)) 699 Diag(Loc, getLangOptions().CPlusPlus? diag::err_vla_cxx : diag::ext_vla); 700 else if (ASM != ArrayType::Normal || Quals != 0) 701 Diag(Loc, 702 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 703 : diag::ext_c99_array_usage); 704 } 705 706 return T; 707} 708 709/// \brief Build an ext-vector type. 710/// 711/// Run the required checks for the extended vector type. 712QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize, 713 SourceLocation AttrLoc) { 714 715 Expr *Arg = (Expr *)ArraySize.get(); 716 717 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 718 // in conjunction with complex types (pointers, arrays, functions, etc.). 719 if (!T->isDependentType() && 720 !T->isIntegerType() && !T->isRealFloatingType()) { 721 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 722 return QualType(); 723 } 724 725 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) { 726 llvm::APSInt vecSize(32); 727 if (!Arg->isIntegerConstantExpr(vecSize, Context)) { 728 Diag(AttrLoc, diag::err_attribute_argument_not_int) 729 << "ext_vector_type" << Arg->getSourceRange(); 730 return QualType(); 731 } 732 733 // unlike gcc's vector_size attribute, the size is specified as the 734 // number of elements, not the number of bytes. 735 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 736 737 if (vectorSize == 0) { 738 Diag(AttrLoc, diag::err_attribute_zero_size) 739 << Arg->getSourceRange(); 740 return QualType(); 741 } 742 743 if (!T->isDependentType()) 744 return Context.getExtVectorType(T, vectorSize); 745 } 746 747 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(), 748 AttrLoc); 749} 750 751/// \brief Build a function type. 752/// 753/// This routine checks the function type according to C++ rules and 754/// under the assumption that the result type and parameter types have 755/// just been instantiated from a template. It therefore duplicates 756/// some of the behavior of GetTypeForDeclarator, but in a much 757/// simpler form that is only suitable for this narrow use case. 758/// 759/// \param T The return type of the function. 760/// 761/// \param ParamTypes The parameter types of the function. This array 762/// will be modified to account for adjustments to the types of the 763/// function parameters. 764/// 765/// \param NumParamTypes The number of parameter types in ParamTypes. 766/// 767/// \param Variadic Whether this is a variadic function type. 768/// 769/// \param Quals The cvr-qualifiers to be applied to the function type. 770/// 771/// \param Loc The location of the entity whose type involves this 772/// function type or, if there is no such entity, the location of the 773/// type that will have function type. 774/// 775/// \param Entity The name of the entity that involves the function 776/// type, if known. 777/// 778/// \returns A suitable function type, if there are no 779/// errors. Otherwise, returns a NULL type. 780QualType Sema::BuildFunctionType(QualType T, 781 QualType *ParamTypes, 782 unsigned NumParamTypes, 783 bool Variadic, unsigned Quals, 784 SourceLocation Loc, DeclarationName Entity) { 785 if (T->isArrayType() || T->isFunctionType()) { 786 Diag(Loc, diag::err_func_returning_array_function) 787 << T->isFunctionType() << T; 788 return QualType(); 789 } 790 791 bool Invalid = false; 792 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 793 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 794 if (ParamType->isVoidType()) { 795 Diag(Loc, diag::err_param_with_void_type); 796 Invalid = true; 797 } 798 799 ParamTypes[Idx] = ParamType; 800 } 801 802 if (Invalid) 803 return QualType(); 804 805 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 806 Quals, false, false, 0, 0, 807 FunctionType::ExtInfo()); 808} 809 810/// \brief Build a member pointer type \c T Class::*. 811/// 812/// \param T the type to which the member pointer refers. 813/// \param Class the class type into which the member pointer points. 814/// \param CVR Qualifiers applied to the member pointer type 815/// \param Loc the location where this type begins 816/// \param Entity the name of the entity that will have this member pointer type 817/// 818/// \returns a member pointer type, if successful, or a NULL type if there was 819/// an error. 820QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 821 unsigned CVR, SourceLocation Loc, 822 DeclarationName Entity) { 823 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 824 825 // Verify that we're not building a pointer to pointer to function with 826 // exception specification. 827 if (CheckDistantExceptionSpec(T)) { 828 Diag(Loc, diag::err_distant_exception_spec); 829 830 // FIXME: If we're doing this as part of template instantiation, 831 // we should return immediately. 832 833 // Build the type anyway, but use the canonical type so that the 834 // exception specifiers are stripped off. 835 T = Context.getCanonicalType(T); 836 } 837 838 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 839 // with reference type, or "cv void." 840 if (T->isReferenceType()) { 841 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 842 << (Entity? Entity.getAsString() : "type name") << T; 843 return QualType(); 844 } 845 846 if (T->isVoidType()) { 847 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 848 << (Entity? Entity.getAsString() : "type name"); 849 return QualType(); 850 } 851 852 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 853 // object or incomplete types shall not be restrict-qualified." 854 if (Quals.hasRestrict() && !T->isIncompleteOrObjectType()) { 855 Diag(Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 856 << T; 857 858 // FIXME: If we're doing this as part of template instantiation, 859 // we should return immediately. 860 Quals.removeRestrict(); 861 } 862 863 if (!Class->isDependentType() && !Class->isRecordType()) { 864 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 865 return QualType(); 866 } 867 868 return Context.getQualifiedType( 869 Context.getMemberPointerType(T, Class.getTypePtr()), Quals); 870} 871 872/// \brief Build a block pointer type. 873/// 874/// \param T The type to which we'll be building a block pointer. 875/// 876/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 877/// 878/// \param Loc The location of the entity whose type involves this 879/// block pointer type or, if there is no such entity, the location of the 880/// type that will have block pointer type. 881/// 882/// \param Entity The name of the entity that involves the block pointer 883/// type, if known. 884/// 885/// \returns A suitable block pointer type, if there are no 886/// errors. Otherwise, returns a NULL type. 887QualType Sema::BuildBlockPointerType(QualType T, unsigned CVR, 888 SourceLocation Loc, 889 DeclarationName Entity) { 890 if (!T->isFunctionType()) { 891 Diag(Loc, diag::err_nonfunction_block_type); 892 return QualType(); 893 } 894 895 Qualifiers Quals = Qualifiers::fromCVRMask(CVR); 896 return Context.getQualifiedType(Context.getBlockPointerType(T), Quals); 897} 898 899QualType Sema::GetTypeFromParser(TypeTy *Ty, TypeSourceInfo **TInfo) { 900 QualType QT = QualType::getFromOpaquePtr(Ty); 901 if (QT.isNull()) { 902 if (TInfo) *TInfo = 0; 903 return QualType(); 904 } 905 906 TypeSourceInfo *DI = 0; 907 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 908 QT = LIT->getType(); 909 DI = LIT->getTypeSourceInfo(); 910 } 911 912 if (TInfo) *TInfo = DI; 913 return QT; 914} 915 916/// GetTypeForDeclarator - Convert the type for the specified 917/// declarator to Type instances. 918/// 919/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 920/// owns the declaration of a type (e.g., the definition of a struct 921/// type), then *OwnedDecl will receive the owned declaration. 922QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 923 TypeSourceInfo **TInfo, 924 TagDecl **OwnedDecl) { 925 // Determine the type of the declarator. Not all forms of declarator 926 // have a type. 927 QualType T; 928 TypeSourceInfo *ReturnTypeInfo = 0; 929 930 llvm::SmallVector<DelayedAttribute,4> FnAttrsFromDeclSpec; 931 932 switch (D.getName().getKind()) { 933 case UnqualifiedId::IK_Identifier: 934 case UnqualifiedId::IK_OperatorFunctionId: 935 case UnqualifiedId::IK_LiteralOperatorId: 936 case UnqualifiedId::IK_TemplateId: 937 T = ConvertDeclSpecToType(*this, D, FnAttrsFromDeclSpec); 938 939 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 940 TagDecl* Owned = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 941 // Owned is embedded if it was defined here, or if it is the 942 // very first (i.e., canonical) declaration of this tag type. 943 Owned->setEmbeddedInDeclarator(Owned->isDefinition() || 944 Owned->isCanonicalDecl()); 945 if (OwnedDecl) *OwnedDecl = Owned; 946 } 947 break; 948 949 case UnqualifiedId::IK_ConstructorName: 950 case UnqualifiedId::IK_ConstructorTemplateId: 951 case UnqualifiedId::IK_DestructorName: 952 // Constructors and destructors don't have return types. Use 953 // "void" instead. 954 T = Context.VoidTy; 955 956 if (TInfo) 957 ReturnTypeInfo = Context.getTrivialTypeSourceInfo(T, 958 D.getName().StartLocation); 959 break; 960 961 case UnqualifiedId::IK_ConversionFunctionId: 962 // The result type of a conversion function is the type that it 963 // converts to. 964 T = GetTypeFromParser(D.getName().ConversionFunctionId, 965 TInfo? &ReturnTypeInfo : 0); 966 break; 967 } 968 969 if (T.isNull()) 970 return T; 971 972 if (T == Context.UndeducedAutoTy) { 973 int Error = -1; 974 975 switch (D.getContext()) { 976 case Declarator::KNRTypeListContext: 977 assert(0 && "K&R type lists aren't allowed in C++"); 978 break; 979 case Declarator::PrototypeContext: 980 Error = 0; // Function prototype 981 break; 982 case Declarator::MemberContext: 983 switch (cast<TagDecl>(CurContext)->getTagKind()) { 984 case TagDecl::TK_enum: assert(0 && "unhandled tag kind"); break; 985 case TagDecl::TK_struct: Error = 1; /* Struct member */ break; 986 case TagDecl::TK_union: Error = 2; /* Union member */ break; 987 case TagDecl::TK_class: Error = 3; /* Class member */ break; 988 } 989 break; 990 case Declarator::CXXCatchContext: 991 Error = 4; // Exception declaration 992 break; 993 case Declarator::TemplateParamContext: 994 Error = 5; // Template parameter 995 break; 996 case Declarator::BlockLiteralContext: 997 Error = 6; // Block literal 998 break; 999 case Declarator::FileContext: 1000 case Declarator::BlockContext: 1001 case Declarator::ForContext: 1002 case Declarator::ConditionContext: 1003 case Declarator::TypeNameContext: 1004 break; 1005 } 1006 1007 if (Error != -1) { 1008 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 1009 << Error; 1010 T = Context.IntTy; 1011 D.setInvalidType(true); 1012 } 1013 } 1014 1015 // The name we're declaring, if any. 1016 DeclarationName Name; 1017 if (D.getIdentifier()) 1018 Name = D.getIdentifier(); 1019 1020 llvm::SmallVector<DelayedAttribute,4> FnAttrsFromPreviousChunk; 1021 1022 // Walk the DeclTypeInfo, building the recursive type as we go. 1023 // DeclTypeInfos are ordered from the identifier out, which is 1024 // opposite of what we want :). 1025 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1026 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); 1027 switch (DeclType.Kind) { 1028 default: assert(0 && "Unknown decltype!"); 1029 case DeclaratorChunk::BlockPointer: 1030 // If blocks are disabled, emit an error. 1031 if (!LangOpts.Blocks) 1032 Diag(DeclType.Loc, diag::err_blocks_disable); 1033 1034 T = BuildBlockPointerType(T, DeclType.Cls.TypeQuals, D.getIdentifierLoc(), 1035 Name); 1036 break; 1037 case DeclaratorChunk::Pointer: 1038 // Verify that we're not building a pointer to pointer to function with 1039 // exception specification. 1040 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1041 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1042 D.setInvalidType(true); 1043 // Build the type anyway. 1044 } 1045 if (getLangOptions().ObjC1 && T->isObjCInterfaceType()) { 1046 const ObjCInterfaceType *OIT = T->getAs<ObjCInterfaceType>(); 1047 T = Context.getObjCObjectPointerType(T, 1048 const_cast<ObjCProtocolDecl **>( 1049 OIT->qual_begin()), 1050 OIT->getNumProtocols(), 1051 DeclType.Ptr.TypeQuals); 1052 break; 1053 } 1054 T = BuildPointerType(T, DeclType.Ptr.TypeQuals, DeclType.Loc, Name); 1055 break; 1056 case DeclaratorChunk::Reference: { 1057 Qualifiers Quals; 1058 if (DeclType.Ref.HasRestrict) Quals.addRestrict(); 1059 1060 // Verify that we're not building a reference to pointer to function with 1061 // exception specification. 1062 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1063 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1064 D.setInvalidType(true); 1065 // Build the type anyway. 1066 } 1067 T = BuildReferenceType(T, DeclType.Ref.LValueRef, Quals, 1068 DeclType.Loc, Name); 1069 break; 1070 } 1071 case DeclaratorChunk::Array: { 1072 // Verify that we're not building an array of pointers to function with 1073 // exception specification. 1074 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1075 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1076 D.setInvalidType(true); 1077 // Build the type anyway. 1078 } 1079 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1080 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 1081 ArrayType::ArraySizeModifier ASM; 1082 if (ATI.isStar) 1083 ASM = ArrayType::Star; 1084 else if (ATI.hasStatic) 1085 ASM = ArrayType::Static; 1086 else 1087 ASM = ArrayType::Normal; 1088 if (ASM == ArrayType::Star && 1089 D.getContext() != Declarator::PrototypeContext) { 1090 // FIXME: This check isn't quite right: it allows star in prototypes 1091 // for function definitions, and disallows some edge cases detailed 1092 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 1093 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 1094 ASM = ArrayType::Normal; 1095 D.setInvalidType(true); 1096 } 1097 T = BuildArrayType(T, ASM, ArraySize, 1098 Qualifiers::fromCVRMask(ATI.TypeQuals), 1099 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 1100 break; 1101 } 1102 case DeclaratorChunk::Function: { 1103 // If the function declarator has a prototype (i.e. it is not () and 1104 // does not have a K&R-style identifier list), then the arguments are part 1105 // of the type, otherwise the argument list is (). 1106 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1107 1108 // C99 6.7.5.3p1: The return type may not be a function or array type. 1109 // For conversion functions, we'll diagnose this particular error later. 1110 if ((T->isArrayType() || T->isFunctionType()) && 1111 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 1112 Diag(DeclType.Loc, diag::err_func_returning_array_function) 1113 << T->isFunctionType() << T; 1114 T = Context.IntTy; 1115 D.setInvalidType(true); 1116 } 1117 1118 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1119 // C++ [dcl.fct]p6: 1120 // Types shall not be defined in return or parameter types. 1121 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 1122 if (Tag->isDefinition()) 1123 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1124 << Context.getTypeDeclType(Tag); 1125 } 1126 1127 // Exception specs are not allowed in typedefs. Complain, but add it 1128 // anyway. 1129 if (FTI.hasExceptionSpec && 1130 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1131 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1132 1133 if (FTI.NumArgs == 0) { 1134 if (getLangOptions().CPlusPlus) { 1135 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 1136 // function takes no arguments. 1137 llvm::SmallVector<QualType, 4> Exceptions; 1138 Exceptions.reserve(FTI.NumExceptions); 1139 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1140 // FIXME: Preserve type source info. 1141 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1142 // Check that the type is valid for an exception spec, and drop it 1143 // if not. 1144 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1145 Exceptions.push_back(ET); 1146 } 1147 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, FTI.TypeQuals, 1148 FTI.hasExceptionSpec, 1149 FTI.hasAnyExceptionSpec, 1150 Exceptions.size(), Exceptions.data(), 1151 FunctionType::ExtInfo()); 1152 } else if (FTI.isVariadic) { 1153 // We allow a zero-parameter variadic function in C if the 1154 // function is marked with the "overloadable" 1155 // attribute. Scan for this attribute now. 1156 bool Overloadable = false; 1157 for (const AttributeList *Attrs = D.getAttributes(); 1158 Attrs; Attrs = Attrs->getNext()) { 1159 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1160 Overloadable = true; 1161 break; 1162 } 1163 } 1164 1165 if (!Overloadable) 1166 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1167 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0, 1168 false, false, 0, 0, 1169 FunctionType::ExtInfo()); 1170 } else { 1171 // Simple void foo(), where the incoming T is the result type. 1172 T = Context.getFunctionNoProtoType(T); 1173 } 1174 } else if (FTI.ArgInfo[0].Param == 0) { 1175 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 1176 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1177 D.setInvalidType(true); 1178 } else { 1179 // Otherwise, we have a function with an argument list that is 1180 // potentially variadic. 1181 llvm::SmallVector<QualType, 16> ArgTys; 1182 1183 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1184 ParmVarDecl *Param = 1185 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 1186 QualType ArgTy = Param->getType(); 1187 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1188 1189 // Adjust the parameter type. 1190 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1191 1192 // Look for 'void'. void is allowed only as a single argument to a 1193 // function with no other parameters (C99 6.7.5.3p10). We record 1194 // int(void) as a FunctionProtoType with an empty argument list. 1195 if (ArgTy->isVoidType()) { 1196 // If this is something like 'float(int, void)', reject it. 'void' 1197 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1198 // have arguments of incomplete type. 1199 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1200 Diag(DeclType.Loc, diag::err_void_only_param); 1201 ArgTy = Context.IntTy; 1202 Param->setType(ArgTy); 1203 } else if (FTI.ArgInfo[i].Ident) { 1204 // Reject, but continue to parse 'int(void abc)'. 1205 Diag(FTI.ArgInfo[i].IdentLoc, 1206 diag::err_param_with_void_type); 1207 ArgTy = Context.IntTy; 1208 Param->setType(ArgTy); 1209 } else { 1210 // Reject, but continue to parse 'float(const void)'. 1211 if (ArgTy.hasQualifiers()) 1212 Diag(DeclType.Loc, diag::err_void_param_qualified); 1213 1214 // Do not add 'void' to the ArgTys list. 1215 break; 1216 } 1217 } else if (!FTI.hasPrototype) { 1218 if (ArgTy->isPromotableIntegerType()) { 1219 ArgTy = Context.getPromotedIntegerType(ArgTy); 1220 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 1221 if (BTy->getKind() == BuiltinType::Float) 1222 ArgTy = Context.DoubleTy; 1223 } 1224 } 1225 1226 ArgTys.push_back(ArgTy); 1227 } 1228 1229 llvm::SmallVector<QualType, 4> Exceptions; 1230 Exceptions.reserve(FTI.NumExceptions); 1231 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1232 // FIXME: Preserve type source info. 1233 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1234 // Check that the type is valid for an exception spec, and drop it if 1235 // not. 1236 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1237 Exceptions.push_back(ET); 1238 } 1239 1240 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1241 FTI.isVariadic, FTI.TypeQuals, 1242 FTI.hasExceptionSpec, 1243 FTI.hasAnyExceptionSpec, 1244 Exceptions.size(), Exceptions.data(), 1245 FunctionType::ExtInfo()); 1246 } 1247 1248 // For GCC compatibility, we allow attributes that apply only to 1249 // function types to be placed on a function's return type 1250 // instead (as long as that type doesn't happen to be function 1251 // or function-pointer itself). 1252 ProcessDelayedFnAttrs(*this, T, FnAttrsFromPreviousChunk); 1253 1254 break; 1255 } 1256 case DeclaratorChunk::MemberPointer: 1257 // Verify that we're not building a pointer to pointer to function with 1258 // exception specification. 1259 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1260 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1261 D.setInvalidType(true); 1262 // Build the type anyway. 1263 } 1264 // The scope spec must refer to a class, or be dependent. 1265 QualType ClsType; 1266 if (DeclType.Mem.Scope().isInvalid()) { 1267 // Avoid emitting extra errors if we already errored on the scope. 1268 D.setInvalidType(true); 1269 } else if (isDependentScopeSpecifier(DeclType.Mem.Scope()) 1270 || dyn_cast_or_null<CXXRecordDecl>( 1271 computeDeclContext(DeclType.Mem.Scope()))) { 1272 NestedNameSpecifier *NNS 1273 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep(); 1274 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 1275 switch (NNS->getKind()) { 1276 case NestedNameSpecifier::Identifier: 1277 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 1278 NNS->getAsIdentifier()); 1279 break; 1280 1281 case NestedNameSpecifier::Namespace: 1282 case NestedNameSpecifier::Global: 1283 llvm_unreachable("Nested-name-specifier must name a type"); 1284 break; 1285 1286 case NestedNameSpecifier::TypeSpec: 1287 case NestedNameSpecifier::TypeSpecWithTemplate: 1288 ClsType = QualType(NNS->getAsType(), 0); 1289 if (NNSPrefix) 1290 ClsType = Context.getQualifiedNameType(NNSPrefix, ClsType); 1291 break; 1292 } 1293 } else { 1294 Diag(DeclType.Mem.Scope().getBeginLoc(), 1295 diag::err_illegal_decl_mempointer_in_nonclass) 1296 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1297 << DeclType.Mem.Scope().getRange(); 1298 D.setInvalidType(true); 1299 } 1300 1301 if (!ClsType.isNull()) 1302 T = BuildMemberPointerType(T, ClsType, DeclType.Mem.TypeQuals, 1303 DeclType.Loc, D.getIdentifier()); 1304 if (T.isNull()) { 1305 T = Context.IntTy; 1306 D.setInvalidType(true); 1307 } 1308 break; 1309 } 1310 1311 if (T.isNull()) { 1312 D.setInvalidType(true); 1313 T = Context.IntTy; 1314 } 1315 1316 DiagnoseDelayedFnAttrs(*this, FnAttrsFromPreviousChunk); 1317 1318 // See if there are any attributes on this declarator chunk. 1319 if (const AttributeList *AL = DeclType.getAttrs()) 1320 ProcessTypeAttributeList(*this, T, false, AL, FnAttrsFromPreviousChunk); 1321 } 1322 1323 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1324 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 1325 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 1326 1327 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1328 // for a nonstatic member function, the function type to which a pointer 1329 // to member refers, or the top-level function type of a function typedef 1330 // declaration. 1331 if (FnTy->getTypeQuals() != 0 && 1332 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1333 ((D.getContext() != Declarator::MemberContext && 1334 (!D.getCXXScopeSpec().isSet() || 1335 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true) 1336 ->isRecord())) || 1337 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1338 if (D.isFunctionDeclarator()) 1339 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1340 else 1341 Diag(D.getIdentifierLoc(), 1342 diag::err_invalid_qualified_typedef_function_type_use); 1343 1344 // Strip the cv-quals from the type. 1345 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1346 FnTy->getNumArgs(), FnTy->isVariadic(), 0, 1347 false, false, 0, 0, FunctionType::ExtInfo()); 1348 } 1349 } 1350 1351 // Process any function attributes we might have delayed from the 1352 // declaration-specifiers. 1353 ProcessDelayedFnAttrs(*this, T, FnAttrsFromDeclSpec); 1354 1355 // If there were any type attributes applied to the decl itself, not 1356 // the type, apply them to the result type. But don't do this for 1357 // block-literal expressions, which are parsed wierdly. 1358 if (D.getContext() != Declarator::BlockLiteralContext) 1359 if (const AttributeList *Attrs = D.getAttributes()) 1360 ProcessTypeAttributeList(*this, T, false, Attrs, 1361 FnAttrsFromPreviousChunk); 1362 1363 DiagnoseDelayedFnAttrs(*this, FnAttrsFromPreviousChunk); 1364 1365 if (TInfo) { 1366 if (D.isInvalidType()) 1367 *TInfo = 0; 1368 else 1369 *TInfo = GetTypeSourceInfoForDeclarator(D, T, ReturnTypeInfo); 1370 } 1371 1372 return T; 1373} 1374 1375namespace { 1376 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 1377 const DeclSpec &DS; 1378 1379 public: 1380 TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {} 1381 1382 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1383 Visit(TL.getUnqualifiedLoc()); 1384 } 1385 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 1386 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1387 } 1388 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 1389 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1390 1391 if (DS.getProtocolQualifiers()) { 1392 assert(TL.getNumProtocols() > 0); 1393 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1394 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1395 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1396 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1397 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1398 } else { 1399 assert(TL.getNumProtocols() == 0); 1400 TL.setLAngleLoc(SourceLocation()); 1401 TL.setRAngleLoc(SourceLocation()); 1402 } 1403 } 1404 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1405 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1406 1407 TL.setStarLoc(SourceLocation()); 1408 1409 if (DS.getProtocolQualifiers()) { 1410 assert(TL.getNumProtocols() > 0); 1411 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1412 TL.setHasProtocolsAsWritten(true); 1413 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1414 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1415 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1416 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1417 1418 } else { 1419 assert(TL.getNumProtocols() == 0); 1420 TL.setHasProtocolsAsWritten(false); 1421 TL.setLAngleLoc(SourceLocation()); 1422 TL.setRAngleLoc(SourceLocation()); 1423 } 1424 1425 // This might not have been written with an inner type. 1426 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 1427 TL.setHasBaseTypeAsWritten(false); 1428 TL.getBaseTypeLoc().initialize(SourceLocation()); 1429 } else { 1430 TL.setHasBaseTypeAsWritten(true); 1431 Visit(TL.getBaseTypeLoc()); 1432 } 1433 } 1434 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 1435 TypeSourceInfo *TInfo = 0; 1436 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1437 1438 // If we got no declarator info from previous Sema routines, 1439 // just fill with the typespec loc. 1440 if (!TInfo) { 1441 TL.initialize(DS.getTypeSpecTypeLoc()); 1442 return; 1443 } 1444 1445 TemplateSpecializationTypeLoc OldTL = 1446 cast<TemplateSpecializationTypeLoc>(TInfo->getTypeLoc()); 1447 TL.copy(OldTL); 1448 } 1449 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 1450 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 1451 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 1452 TL.setParensRange(DS.getTypeofParensRange()); 1453 } 1454 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 1455 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 1456 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 1457 TL.setParensRange(DS.getTypeofParensRange()); 1458 assert(DS.getTypeRep()); 1459 TypeSourceInfo *TInfo = 0; 1460 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1461 TL.setUnderlyingTInfo(TInfo); 1462 } 1463 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 1464 // By default, use the source location of the type specifier. 1465 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 1466 if (TL.needsExtraLocalData()) { 1467 // Set info for the written builtin specifiers. 1468 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 1469 // Try to have a meaningful source location. 1470 if (TL.getWrittenSignSpec() != TSS_unspecified) 1471 // Sign spec loc overrides the others (e.g., 'unsigned long'). 1472 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 1473 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 1474 // Width spec loc overrides type spec loc (e.g., 'short int'). 1475 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 1476 } 1477 } 1478 void VisitTypeLoc(TypeLoc TL) { 1479 // FIXME: add other typespec types and change this to an assert. 1480 TL.initialize(DS.getTypeSpecTypeLoc()); 1481 } 1482 }; 1483 1484 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 1485 const DeclaratorChunk &Chunk; 1486 1487 public: 1488 DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {} 1489 1490 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1491 llvm_unreachable("qualified type locs not expected here!"); 1492 } 1493 1494 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 1495 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 1496 TL.setCaretLoc(Chunk.Loc); 1497 } 1498 void VisitPointerTypeLoc(PointerTypeLoc TL) { 1499 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1500 TL.setStarLoc(Chunk.Loc); 1501 } 1502 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1503 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1504 TL.setStarLoc(Chunk.Loc); 1505 TL.setHasBaseTypeAsWritten(true); 1506 TL.setHasProtocolsAsWritten(false); 1507 TL.setLAngleLoc(SourceLocation()); 1508 TL.setRAngleLoc(SourceLocation()); 1509 } 1510 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 1511 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 1512 TL.setStarLoc(Chunk.Loc); 1513 // FIXME: nested name specifier 1514 } 1515 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 1516 assert(Chunk.Kind == DeclaratorChunk::Reference); 1517 // 'Amp' is misleading: this might have been originally 1518 /// spelled with AmpAmp. 1519 TL.setAmpLoc(Chunk.Loc); 1520 } 1521 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 1522 assert(Chunk.Kind == DeclaratorChunk::Reference); 1523 assert(!Chunk.Ref.LValueRef); 1524 TL.setAmpAmpLoc(Chunk.Loc); 1525 } 1526 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 1527 assert(Chunk.Kind == DeclaratorChunk::Array); 1528 TL.setLBracketLoc(Chunk.Loc); 1529 TL.setRBracketLoc(Chunk.EndLoc); 1530 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 1531 } 1532 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 1533 assert(Chunk.Kind == DeclaratorChunk::Function); 1534 TL.setLParenLoc(Chunk.Loc); 1535 TL.setRParenLoc(Chunk.EndLoc); 1536 1537 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 1538 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 1539 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1540 TL.setArg(tpi++, Param); 1541 } 1542 // FIXME: exception specs 1543 } 1544 1545 void VisitTypeLoc(TypeLoc TL) { 1546 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 1547 } 1548 }; 1549} 1550 1551/// \brief Create and instantiate a TypeSourceInfo with type source information. 1552/// 1553/// \param T QualType referring to the type as written in source code. 1554/// 1555/// \param ReturnTypeInfo For declarators whose return type does not show 1556/// up in the normal place in the declaration specifiers (such as a C++ 1557/// conversion function), this pointer will refer to a type source information 1558/// for that return type. 1559TypeSourceInfo * 1560Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 1561 TypeSourceInfo *ReturnTypeInfo) { 1562 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 1563 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 1564 1565 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1566 DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL); 1567 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 1568 } 1569 1570 TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL); 1571 1572 // We have source information for the return type that was not in the 1573 // declaration specifiers; copy that information into the current type 1574 // location so that it will be retained. This occurs, for example, with 1575 // a C++ conversion function, where the return type occurs within the 1576 // declarator-id rather than in the declaration specifiers. 1577 if (ReturnTypeInfo && D.getDeclSpec().getTypeSpecType() == TST_unspecified) { 1578 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 1579 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 1580 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 1581 } 1582 1583 return TInfo; 1584} 1585 1586/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 1587QualType Sema::CreateLocInfoType(QualType T, TypeSourceInfo *TInfo) { 1588 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 1589 // and Sema during declaration parsing. Try deallocating/caching them when 1590 // it's appropriate, instead of allocating them and keeping them around. 1591 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8); 1592 new (LocT) LocInfoType(T, TInfo); 1593 assert(LocT->getTypeClass() != T->getTypeClass() && 1594 "LocInfoType's TypeClass conflicts with an existing Type class"); 1595 return QualType(LocT, 0); 1596} 1597 1598void LocInfoType::getAsStringInternal(std::string &Str, 1599 const PrintingPolicy &Policy) const { 1600 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*" 1601 " was used directly instead of getting the QualType through" 1602 " GetTypeFromParser"); 1603} 1604 1605/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1606/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1607/// they point to and return true. If T1 and T2 aren't pointer types 1608/// or pointer-to-member types, or if they are not similar at this 1609/// level, returns false and leaves T1 and T2 unchanged. Top-level 1610/// qualifiers on T1 and T2 are ignored. This function will typically 1611/// be called in a loop that successively "unwraps" pointer and 1612/// pointer-to-member types to compare them at each level. 1613bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1614 const PointerType *T1PtrType = T1->getAs<PointerType>(), 1615 *T2PtrType = T2->getAs<PointerType>(); 1616 if (T1PtrType && T2PtrType) { 1617 T1 = T1PtrType->getPointeeType(); 1618 T2 = T2PtrType->getPointeeType(); 1619 return true; 1620 } 1621 1622 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 1623 *T2MPType = T2->getAs<MemberPointerType>(); 1624 if (T1MPType && T2MPType && 1625 Context.getCanonicalType(T1MPType->getClass()) == 1626 Context.getCanonicalType(T2MPType->getClass())) { 1627 T1 = T1MPType->getPointeeType(); 1628 T2 = T2MPType->getPointeeType(); 1629 return true; 1630 } 1631 return false; 1632} 1633 1634Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1635 // C99 6.7.6: Type names have no identifier. This is already validated by 1636 // the parser. 1637 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1638 1639 TypeSourceInfo *TInfo = 0; 1640 TagDecl *OwnedTag = 0; 1641 QualType T = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 1642 if (D.isInvalidType()) 1643 return true; 1644 1645 if (getLangOptions().CPlusPlus) { 1646 // Check that there are no default arguments (C++ only). 1647 CheckExtraCXXDefaultArguments(D); 1648 1649 // C++0x [dcl.type]p3: 1650 // A type-specifier-seq shall not define a class or enumeration 1651 // unless it appears in the type-id of an alias-declaration 1652 // (7.1.3). 1653 if (OwnedTag && OwnedTag->isDefinition()) 1654 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1655 << Context.getTypeDeclType(OwnedTag); 1656 } 1657 1658 if (TInfo) 1659 T = CreateLocInfoType(T, TInfo); 1660 1661 return T.getAsOpaquePtr(); 1662} 1663 1664 1665 1666//===----------------------------------------------------------------------===// 1667// Type Attribute Processing 1668//===----------------------------------------------------------------------===// 1669 1670/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1671/// specified type. The attribute contains 1 argument, the id of the address 1672/// space for the type. 1673static void HandleAddressSpaceTypeAttribute(QualType &Type, 1674 const AttributeList &Attr, Sema &S){ 1675 1676 // If this type is already address space qualified, reject it. 1677 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1678 // for two or more different address spaces." 1679 if (Type.getAddressSpace()) { 1680 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1681 return; 1682 } 1683 1684 // Check the attribute arguments. 1685 if (Attr.getNumArgs() != 1) { 1686 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1687 return; 1688 } 1689 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1690 llvm::APSInt addrSpace(32); 1691 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1692 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1693 << ASArgExpr->getSourceRange(); 1694 return; 1695 } 1696 1697 // Bounds checking. 1698 if (addrSpace.isSigned()) { 1699 if (addrSpace.isNegative()) { 1700 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1701 << ASArgExpr->getSourceRange(); 1702 return; 1703 } 1704 addrSpace.setIsSigned(false); 1705 } 1706 llvm::APSInt max(addrSpace.getBitWidth()); 1707 max = Qualifiers::MaxAddressSpace; 1708 if (addrSpace > max) { 1709 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1710 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 1711 return; 1712 } 1713 1714 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1715 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1716} 1717 1718/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1719/// specified type. The attribute contains 1 argument, weak or strong. 1720static void HandleObjCGCTypeAttribute(QualType &Type, 1721 const AttributeList &Attr, Sema &S) { 1722 if (Type.getObjCGCAttr() != Qualifiers::GCNone) { 1723 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1724 return; 1725 } 1726 1727 // Check the attribute arguments. 1728 if (!Attr.getParameterName()) { 1729 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1730 << "objc_gc" << 1; 1731 return; 1732 } 1733 Qualifiers::GC GCAttr; 1734 if (Attr.getNumArgs() != 0) { 1735 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1736 return; 1737 } 1738 if (Attr.getParameterName()->isStr("weak")) 1739 GCAttr = Qualifiers::Weak; 1740 else if (Attr.getParameterName()->isStr("strong")) 1741 GCAttr = Qualifiers::Strong; 1742 else { 1743 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1744 << "objc_gc" << Attr.getParameterName(); 1745 return; 1746 } 1747 1748 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1749} 1750 1751/// Process an individual function attribute. Returns true if the 1752/// attribute does not make sense to apply to this type. 1753bool ProcessFnAttr(Sema &S, QualType &Type, const AttributeList &Attr) { 1754 if (Attr.getKind() == AttributeList::AT_noreturn) { 1755 // Complain immediately if the arg count is wrong. 1756 if (Attr.getNumArgs() != 0) { 1757 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1758 return false; 1759 } 1760 1761 // Delay if this is not a function or pointer to block. 1762 if (!Type->isFunctionPointerType() 1763 && !Type->isBlockPointerType() 1764 && !Type->isFunctionType()) 1765 return true; 1766 1767 // Otherwise we can process right away. 1768 Type = S.Context.getNoReturnType(Type); 1769 return false; 1770 } 1771 1772 if (Attr.getKind() == AttributeList::AT_regparm) { 1773 // The warning is emitted elsewhere 1774 if (Attr.getNumArgs() != 1) { 1775 return false; 1776 } 1777 1778 // Delay if this is not a function or pointer to block. 1779 if (!Type->isFunctionPointerType() 1780 && !Type->isBlockPointerType() 1781 && !Type->isFunctionType()) 1782 return true; 1783 1784 // Otherwise we can process right away. 1785 Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArg(0)); 1786 llvm::APSInt NumParams(32); 1787 1788 // The warning is emitted elsewhere 1789 if (!NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) 1790 return false; 1791 1792 Type = S.Context.getRegParmType(Type, NumParams.getZExtValue()); 1793 return false; 1794 } 1795 1796 // Otherwise, a calling convention. 1797 if (Attr.getNumArgs() != 0) { 1798 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1799 return false; 1800 } 1801 1802 QualType T = Type; 1803 if (const PointerType *PT = Type->getAs<PointerType>()) 1804 T = PT->getPointeeType(); 1805 const FunctionType *Fn = T->getAs<FunctionType>(); 1806 1807 // Delay if the type didn't work out to a function. 1808 if (!Fn) return true; 1809 1810 // TODO: diagnose uses of these conventions on the wrong target. 1811 CallingConv CC; 1812 switch (Attr.getKind()) { 1813 case AttributeList::AT_cdecl: CC = CC_C; break; 1814 case AttributeList::AT_fastcall: CC = CC_X86FastCall; break; 1815 case AttributeList::AT_stdcall: CC = CC_X86StdCall; break; 1816 default: llvm_unreachable("unexpected attribute kind"); return false; 1817 } 1818 1819 CallingConv CCOld = Fn->getCallConv(); 1820 if (S.Context.getCanonicalCallConv(CC) == 1821 S.Context.getCanonicalCallConv(CCOld)) return false; 1822 1823 if (CCOld != CC_Default) { 1824 // Should we diagnose reapplications of the same convention? 1825 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) 1826 << FunctionType::getNameForCallConv(CC) 1827 << FunctionType::getNameForCallConv(CCOld); 1828 return false; 1829 } 1830 1831 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 1832 if (CC == CC_X86FastCall) { 1833 if (isa<FunctionNoProtoType>(Fn)) { 1834 S.Diag(Attr.getLoc(), diag::err_cconv_knr) 1835 << FunctionType::getNameForCallConv(CC); 1836 return false; 1837 } 1838 1839 const FunctionProtoType *FnP = cast<FunctionProtoType>(Fn); 1840 if (FnP->isVariadic()) { 1841 S.Diag(Attr.getLoc(), diag::err_cconv_varargs) 1842 << FunctionType::getNameForCallConv(CC); 1843 return false; 1844 } 1845 } 1846 1847 Type = S.Context.getCallConvType(Type, CC); 1848 return false; 1849} 1850 1851/// HandleVectorSizeAttribute - this attribute is only applicable to integral 1852/// and float scalars, although arrays, pointers, and function return values are 1853/// allowed in conjunction with this construct. Aggregates with this attribute 1854/// are invalid, even if they are of the same size as a corresponding scalar. 1855/// The raw attribute should contain precisely 1 argument, the vector size for 1856/// the variable, measured in bytes. If curType and rawAttr are well formed, 1857/// this routine will return a new vector type. 1858static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, Sema &S) { 1859 // Check the attribute arugments. 1860 if (Attr.getNumArgs() != 1) { 1861 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1862 return; 1863 } 1864 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 1865 llvm::APSInt vecSize(32); 1866 if (!sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 1867 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 1868 << "vector_size" << sizeExpr->getSourceRange(); 1869 return; 1870 } 1871 // the base type must be integer or float, and can't already be a vector. 1872 if (CurType->isVectorType() || 1873 (!CurType->isIntegerType() && !CurType->isRealFloatingType())) { 1874 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 1875 return; 1876 } 1877 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 1878 // vecSize is specified in bytes - convert to bits. 1879 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 1880 1881 // the vector size needs to be an integral multiple of the type size. 1882 if (vectorSize % typeSize) { 1883 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 1884 << sizeExpr->getSourceRange(); 1885 return; 1886 } 1887 if (vectorSize == 0) { 1888 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 1889 << sizeExpr->getSourceRange(); 1890 return; 1891 } 1892 1893 // Success! Instantiate the vector type, the number of elements is > 0, and 1894 // not required to be a power of 2, unlike GCC. 1895 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, false, false); 1896} 1897 1898void ProcessTypeAttributeList(Sema &S, QualType &Result, 1899 bool IsDeclSpec, const AttributeList *AL, 1900 DelayedAttributeSet &FnAttrs) { 1901 // Scan through and apply attributes to this type where it makes sense. Some 1902 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1903 // type, but others can be present in the type specifiers even though they 1904 // apply to the decl. Here we apply type attributes and ignore the rest. 1905 for (; AL; AL = AL->getNext()) { 1906 // If this is an attribute we can handle, do so now, otherwise, add it to 1907 // the LeftOverAttrs list for rechaining. 1908 switch (AL->getKind()) { 1909 default: break; 1910 1911 case AttributeList::AT_address_space: 1912 HandleAddressSpaceTypeAttribute(Result, *AL, S); 1913 break; 1914 case AttributeList::AT_objc_gc: 1915 HandleObjCGCTypeAttribute(Result, *AL, S); 1916 break; 1917 case AttributeList::AT_vector_size: 1918 HandleVectorSizeAttr(Result, *AL, S); 1919 break; 1920 1921 case AttributeList::AT_noreturn: 1922 case AttributeList::AT_cdecl: 1923 case AttributeList::AT_fastcall: 1924 case AttributeList::AT_stdcall: 1925 case AttributeList::AT_regparm: 1926 // Don't process these on the DeclSpec. 1927 if (IsDeclSpec || 1928 ProcessFnAttr(S, Result, *AL)) 1929 FnAttrs.push_back(DelayedAttribute(AL, Result)); 1930 break; 1931 } 1932 } 1933} 1934 1935/// @brief Ensure that the type T is a complete type. 1936/// 1937/// This routine checks whether the type @p T is complete in any 1938/// context where a complete type is required. If @p T is a complete 1939/// type, returns false. If @p T is a class template specialization, 1940/// this routine then attempts to perform class template 1941/// instantiation. If instantiation fails, or if @p T is incomplete 1942/// and cannot be completed, issues the diagnostic @p diag (giving it 1943/// the type @p T) and returns true. 1944/// 1945/// @param Loc The location in the source that the incomplete type 1946/// diagnostic should refer to. 1947/// 1948/// @param T The type that this routine is examining for completeness. 1949/// 1950/// @param PD The partial diagnostic that will be printed out if T is not a 1951/// complete type. 1952/// 1953/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 1954/// @c false otherwise. 1955bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 1956 const PartialDiagnostic &PD, 1957 std::pair<SourceLocation, 1958 PartialDiagnostic> Note) { 1959 unsigned diag = PD.getDiagID(); 1960 1961 // FIXME: Add this assertion to make sure we always get instantiation points. 1962 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 1963 // FIXME: Add this assertion to help us flush out problems with 1964 // checking for dependent types and type-dependent expressions. 1965 // 1966 // assert(!T->isDependentType() && 1967 // "Can't ask whether a dependent type is complete"); 1968 1969 // If we have a complete type, we're done. 1970 if (!T->isIncompleteType()) 1971 return false; 1972 1973 // If we have a class template specialization or a class member of a 1974 // class template specialization, or an array with known size of such, 1975 // try to instantiate it. 1976 QualType MaybeTemplate = T; 1977 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 1978 MaybeTemplate = Array->getElementType(); 1979 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 1980 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 1981 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 1982 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 1983 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 1984 TSK_ImplicitInstantiation, 1985 /*Complain=*/diag != 0); 1986 } else if (CXXRecordDecl *Rec 1987 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 1988 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 1989 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 1990 assert(MSInfo && "Missing member specialization information?"); 1991 // This record was instantiated from a class within a template. 1992 if (MSInfo->getTemplateSpecializationKind() 1993 != TSK_ExplicitSpecialization) 1994 return InstantiateClass(Loc, Rec, Pattern, 1995 getTemplateInstantiationArgs(Rec), 1996 TSK_ImplicitInstantiation, 1997 /*Complain=*/diag != 0); 1998 } 1999 } 2000 } 2001 2002 if (diag == 0) 2003 return true; 2004 2005 const TagType *Tag = 0; 2006 if (const RecordType *Record = T->getAs<RecordType>()) 2007 Tag = Record; 2008 else if (const EnumType *Enum = T->getAs<EnumType>()) 2009 Tag = Enum; 2010 2011 // Avoid diagnosing invalid decls as incomplete. 2012 if (Tag && Tag->getDecl()->isInvalidDecl()) 2013 return true; 2014 2015 // We have an incomplete type. Produce a diagnostic. 2016 Diag(Loc, PD) << T; 2017 2018 // If we have a note, produce it. 2019 if (!Note.first.isInvalid()) 2020 Diag(Note.first, Note.second); 2021 2022 // If the type was a forward declaration of a class/struct/union 2023 // type, produce a note. 2024 if (Tag && !Tag->getDecl()->isInvalidDecl()) 2025 Diag(Tag->getDecl()->getLocation(), 2026 Tag->isBeingDefined() ? diag::note_type_being_defined 2027 : diag::note_forward_declaration) 2028 << QualType(Tag, 0); 2029 2030 return true; 2031} 2032 2033bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2034 const PartialDiagnostic &PD) { 2035 return RequireCompleteType(Loc, T, PD, 2036 std::make_pair(SourceLocation(), PDiag(0))); 2037} 2038 2039bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2040 unsigned DiagID) { 2041 return RequireCompleteType(Loc, T, PDiag(DiagID), 2042 std::make_pair(SourceLocation(), PDiag(0))); 2043} 2044 2045/// \brief Retrieve a version of the type 'T' that is qualified by the 2046/// nested-name-specifier contained in SS. 2047QualType Sema::getQualifiedNameType(const CXXScopeSpec &SS, QualType T) { 2048 if (!SS.isSet() || SS.isInvalid() || T.isNull()) 2049 return T; 2050 2051 NestedNameSpecifier *NNS 2052 = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2053 return Context.getQualifiedNameType(NNS, T); 2054} 2055 2056QualType Sema::BuildTypeofExprType(Expr *E) { 2057 if (E->getType() == Context.OverloadTy) { 2058 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 2059 // function template specialization wherever deduction cannot occur. 2060 if (FunctionDecl *Specialization 2061 = ResolveSingleFunctionTemplateSpecialization(E)) { 2062 // The access doesn't really matter in this case. 2063 DeclAccessPair Found = DeclAccessPair::make(Specialization, 2064 Specialization->getAccess()); 2065 E = FixOverloadedFunctionReference(E, Found, Specialization); 2066 if (!E) 2067 return QualType(); 2068 } else { 2069 Diag(E->getLocStart(), 2070 diag::err_cannot_determine_declared_type_of_overloaded_function) 2071 << false << E->getSourceRange(); 2072 return QualType(); 2073 } 2074 } 2075 2076 return Context.getTypeOfExprType(E); 2077} 2078 2079QualType Sema::BuildDecltypeType(Expr *E) { 2080 if (E->getType() == Context.OverloadTy) { 2081 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 2082 // function template specialization wherever deduction cannot occur. 2083 if (FunctionDecl *Specialization 2084 = ResolveSingleFunctionTemplateSpecialization(E)) { 2085 // The access doesn't really matter in this case. 2086 DeclAccessPair Found = DeclAccessPair::make(Specialization, 2087 Specialization->getAccess()); 2088 E = FixOverloadedFunctionReference(E, Found, Specialization); 2089 if (!E) 2090 return QualType(); 2091 } else { 2092 Diag(E->getLocStart(), 2093 diag::err_cannot_determine_declared_type_of_overloaded_function) 2094 << true << E->getSourceRange(); 2095 return QualType(); 2096 } 2097 } 2098 2099 return Context.getDecltypeType(E); 2100} 2101